chore(site): refactor meta.json to index.md (#12459)

Author: benmccann

documentation/docs/10-getting-started/index.md

@@ -0,0 +1,3 @@
+---
+title: Getting started
+---

documentation/docs/10-getting-started/meta.json

@@ -0,0 +1,3 @@
+---
+title: Core concepts
+---

documentation/docs/20-core-concepts/index.md

@@ -0,0 +1,3 @@
+---
+title: Build and deploy
+---

documentation/docs/20-core-concepts/meta.json

@@ -0,0 +1,3 @@
+---
+title: Advanced
+---

documentation/docs/25-build-and-deploy/index.md

@@ -0,0 +1,3 @@
+---
+title: Best practices
+---

documentation/docs/25-build-and-deploy/meta.json

@@ -0,0 +1,3 @@
+---
+title: Reference
+---

documentation/docs/30-advanced/index.md

@@ -0,0 +1,3 @@
+---
+title: Appendix
+---

documentation/docs/30-advanced/meta.json

@@ -12,25 +12,30 @@ import { render_content } from '../renderer';
 import { read } from '$app/server';
 import { error } from '@sveltejs/kit';
 
-const meta = import.meta.glob('../../../../../../documentation/docs/*/meta.json', {
+const meta = import.meta.glob('../../../../../../documentation/docs/*/index.md', {
 	query: '?url',
 	import: 'default',
 	eager: true
 });
 
-const markdown = import.meta.glob('../../../../../../documentation/docs/*/*.md', {
-	query: '?url',
-	import: 'default',
-	eager: true
-});
+const markdown = import.meta.glob(
+	'../../../../../../documentation/docs/*/[[:digit:]][[:digit:]]-*.md',
+	{
+		query: '?url',
+		import: 'default',
+		eager: true
+	}
+);
 
 export const categories = {};
 export const pages = {};
 
 for (const [file, asset] of Object.entries(meta)) {
-	const slug = /\/\d{2}-(.+)\/meta\.json$/.exec(file)[1];
+	const slug = /\/\d{2}-(.+)\/index\.md$/.exec(file)[1];
 
-	const { title, draft } = await read(asset).json();
+	const {
+		metadata: { title, draft }
+	} = extractFrontmatter(await read(asset).text());
 
 	if (draft) continue;